Table 3.
Relationships of irisin and fibroplast growth factor-21 (FGF-21) with energy measures in rhythmic gymnasts (RG) and untrained controls (UC).
| Variables | Irisin (ng/mL) | FGF-21 (ng/mL) | ||
|---|---|---|---|---|
| r | p Value | r | p Value | |
| Fat mass (kg) | ||||
| RG | 0.25 | 0.154 | 0.46 | 0.007 |
| UC | −0.07 | 0.764 | 0.44 | 0.054 |
| Lean mass (kg) | ||||
| RG | 0.29 | 0.101 | 0.28 | 0.144 |
| UC | −0.20 | 0.398 | −0.31 | 0.187 |
| REE (kcal/day) | ||||
| RG | 0.4 | 0.021 | 0.26 | 0.143 |
| UC | −0.05 | 0.838 | 0.26 | 0.27 |
| Training volume (h/week) | ||||
| RG | 0.14 | 0.426 | −0.34 | 0.056 |
| UC | 0.03 | 0.886 | −0.21 | 0.365 |
| VO2peak/kg (mL/min/kg) | ||||
| RG | 0.04 | 0.826 | 0.19 | 0.299 |
| UC | 0.12 | 0.618 | 0.23 | 0.316 |
| Leptin (ng/mL) | ||||
| RG | 0.6 | <0.0001 | 0.45 | 0.009 |
| UC | 0.07 | 0.777 | 0.54 | 0.014 |
| Resistin (ng/mL) | ||||
| RG | 0.31 | 0.076 | 0.04 | 0.808 |
| UC | 0.47 | 0.036 | 0.21 | 0.376 |
REE, resting energy expenditure; VO2peak/kg, peak oxygen consumption per kg lean body mass. Correlations with p < 0.05 are listed in bold.